Finding the Fourth Proportional to 54,556.72, 81,786.56 and 21,300.08

Step by Step Solution

1. Step 1: Write the proportion equation
   54,556.72 : 81,786.56 = 21,300.08 : x
2. Step 2: Convert to fraction form
   54,556.72/81,786.56 = 21,300.08/x
3. Step 3: Cross multiply
   54,556.72x = 81,786.56 × 21,300.08
4. Step 4: Simplify right side
   54,556.72x = 1,742,060,335.35
5. Step 5: Solve for x
   x = 1,742,060,335.35/54,556.72
6. Step 6: Final answer
   x = 31,931.18